This may be an obvious "No", but here goes...
I'm using TestFlight, and I like to add build notes in the "What to test" field on the TestFlight page in iTunes Connect. However, the only way any users will actually see those notes is if you're able to slip them in and hit "Save" before the build finishes processing. If you add them after that point, the users don't ever know "What to test" because neither the email notification nor the TestFlight app itself will show the notes! This is absolutely ridiculous, of course, so is there another way? It'd be great if you could add a build the way you add an app (i.e. before you actually submit anything).
If you do what User9527 said BEFORE you do the export compliance, it will show your test notes in the email and in test flight. So after your build uploads, do this: Open iTunes Connect Select your App, click Tab TestFlight Click iOS -> [select one of your builds] -> Test Details Now you are able to edit What to test as follows Then save it. Then do your export compliance. Then the email goes out and you are all set!!